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Railways PYQCBT 1 2016

RRB NTPC · Question 34

The factors of x^2 + 8x + 12 are: A. (x + 6) (x + 2) B. (x - 6) (x + 2) C. (x - 4)^2 D. (x + 6)(x - 2)

  1. B

  2. A

  3. C

  4. D

Show answer & explanation

Answer: (B) A

Explanation

Find two numbers with product 12 and sum 8: they are 6 and 2. So x² + 8x + 12 = (x + 6)(x + 2).